Tuned Circuit and Tuned Amplifiermsn/223410tuned.pdf · 2005-11-24 · From the tuned amplifier (a)...

1

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 0

Asst. Prof. Dr. Asst. Prof. Dr. MontreeMontree SIRIPRUCHYANUNSIRIPRUCHYANUNDept. of Teacher Training in Electrical Engineering,King Mongkut’s Institute of Technology North Bangkok

Tuned Circuit and Tuned AmplifierTuned Circuit and Tuned Amplifier

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 1

2

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 2

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 3

3

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 4

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 5

4

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 6

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 7

5

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 8

Find the resonant frequency, Q, Bandwidth and the haft-power frequencies of a series circuit having L=5μH, C=100pF and R=10ΩAns: fo=7.12MHz, Q=22.4, B=318kHz, fL=6.96MHz and fH=7.28MHz

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 9

6

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 10

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 11

A parallel RLC circuit has an inductance of 100nH, Q =100,a resonant frequency of 100MHz, and Find R, C, Bandwidth and the haft-power frequencies Ans: R=6.28kΩ, C=25.3pF, B=1MHz, fL=99.5MHz and fH=100.5MHz

7

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 12

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 13

8

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 14

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 15

9

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 16

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 17

10

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 18

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 19

11

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 20

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 21

12

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 22

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 23

13

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 24

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 25

14

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 26

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 27

The resonant frequency of the circuit shown is 860kHz, and the -3dB bandwidth is 25kHz. Calculate Qo, the Q of the coil (L=200μH)

15

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 28

The coil Q is 80 while the Q of the capacitor is 200 at the resonant frequency. Plot the frequency re4sponse of the circuit shown.(L=300μH not 300mH)

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 29

The circuit shown resonates at 600kHz and has a bandwidth of 15kHz. Assuming ideal capacitors, calculate the inductance of the coil and the coil Q.

16

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 30

The coil Q is 50 at the resonant frequency. The peak magnitude input of vin is 2V

(a) Select C1 and C2 to result in fo=300kHz and a bandwidth of BW=15kHz.

(b) Calculate vout at resonance.

(c) Calculate vout at f=280kHz.

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 31

The transistor β is 100 and rout=200kΩ. The coil Q is 40 at the desired resonant frequency of 1MHz. The bandwidth of vout is to be 50kHz

(a) Calculate the capacitance needed.

(b) Select the value of R1 required.

(c) Calculate the resonant voltage gain.

17

Asst. Prof. Dr. Montree Siripruchyanun

11/24/2005 Asst. Prof. Dr. Montree Siripruchyanun 32

From the tuned amplifier

(a) Calculate C1 and C2 to maintain a resonant frequency of 1MHz and a bandwidth of 50kHz.

(b) Calculate the resonant frequency voltage gain.